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Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
 [1]
Trade accounts receivable, allowance for doubtful accounts $ 302 $ 296
Preferred stock, par value (in dollars per share) $ 0.10 $ 0.10
Preferred stock, shares authorized (in shares) 1,000,000 1,000,000
Preferred stock, shares issued (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.10 $ 0.10
Common stock, shares authorized (in shares) 40,000,000 40,000,000
Common stock, shares issued (in shares) 20,134,596 20,053,335
Common stock, shares outstanding (in shares) 15,733,414 15,920,585
Treasury stock, shares (in shares) 4,401,182 4,132,750
[1] Effective January 1, 2019, the Company adopted Accounting Standards Codification Topic 842 (ASC 842), Leases. Shareholders’ equity as of December 31, 2018 has been adjusted for the effects of the new standard. See Note 1 for further information.